drm/vmwgfx: Add debug message for layout change ioctl

Add debug code to check user-space layout change request.
Signed-off-by: Deepak Rawat <drawat@vmware.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>

drivers/gpu/drm/vmwgfx/vmwgfx_drv.h

@@ -1333,6 +1333,14 @@ int vmw_host_log(const char *log);
 #define VMW_DEBUG_USER(fmt, ...)                                              \
 	DRM_DEBUG_DRIVER(fmt, ##__VA_ARGS__)
 
+/**
+ * VMW_DEBUG_KMS - Debug output for kernel mode-setting
+ *
+ * This macro is for debugging vmwgfx mode-setting code.
+ */
+#define VMW_DEBUG_KMS(fmt, ...)                                               \
+	DRM_DEBUG_DRIVER(fmt, ##__VA_ARGS__)
+
 /**
  * Inline helper functions
  */

drivers/gpu/drm/vmwgfx/vmwgfx_kms.c

@@ -2339,6 +2339,9 @@ int vmw_kms_update_layout_ioctl(struct drm_device *dev, void *data,
 
 	if (!arg->num_outputs) {
 		struct drm_rect def_rect = {0, 0, 800, 600};
+		VMW_DEBUG_KMS("Default layout x1 = %d y1 = %d x2 = %d y2 = %d\n",
+			      def_rect.x1, def_rect.y1,
+			      def_rect.x2, def_rect.y2);
 		vmw_du_update_layout(dev_priv, 1, &def_rect);
 		return 0;
 	}
@@ -2359,6 +2362,7 @@ int vmw_kms_update_layout_ioctl(struct drm_device *dev, void *data,
 
 	drm_rects = (struct drm_rect *)rects;
 
+	VMW_DEBUG_KMS("Layout count = %u\n", arg->num_outputs);
 	for (i = 0; i < arg->num_outputs; i++) {
 		struct drm_vmw_rect curr_rect;
 
@@ -2375,6 +2379,10 @@ int vmw_kms_update_layout_ioctl(struct drm_device *dev, void *data,
 		drm_rects[i].x2 = curr_rect.x + curr_rect.w;
 		drm_rects[i].y2 = curr_rect.y + curr_rect.h;
 
+		VMW_DEBUG_KMS("  x1 = %d y1 = %d x2 = %d y2 = %d\n",
+			      drm_rects[i].x1, drm_rects[i].y1,
+			      drm_rects[i].x2, drm_rects[i].y2);
+
 		/*
 		 * Currently this check is limiting the topology within
 		 * mode_config->max (which actually is max texture size